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Quantum versus classical domains for teleportation with continuous variables

Braunstein, Sameul L. and Fuchs, Christopher A. and Kimble, H. J. and van Loock, P. (2001) Quantum versus classical domains for teleportation with continuous variables. Physical Review A, 64 (2). Art. No. 022321. ISSN 1050-2947. doi:10.1103/PhysRevA.64.022321.

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By considering the utilization of a classical channel without quantum entanglement, fidelity Fclassical=1/2 has been established as setting the boundary between classical and quantum domains in the teleportation of coherent states of the electromagnetic field [S. L. Braunstein, C. A. Fuchs, and H. J. Kimble, J. Mod. Opt. 47, 267 (2000)]. We further examine the quantum-classical boundary by investigating questions of entanglement and Bell-inequality violations for the Einstein-Podolsky-Rosen states relevant to continuous variable teleportation. The threshold fidelity for employing entanglement as a quantum resource in teleportation of coherent states is again found to be Fclassical=1/2. Likewise, violations of local realism onset at this same threshold, with the added requirement of overall efficiency η>2/3 in the unconditional case. By contrast, recently proposed criteria adapted from the literature on quantum-nondemolition detection are shown to be largely unrelated to the questions of entanglement and Bell-inequality violations.

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Additional Information:© 2001 The American Physical Society Received 3 December 2000; published 18 July 2001 H.J.K. gratefully acknowledges critical input from A. C. Doherty, H. Mabuchi, E. S. Polzik, and J. P. Preskill, and support from the NSF (Grant No. PHY-9722674), the Institute for Quantum Information (IQI) funded by the NSF-ITR Program, the Caltech MURI on Quantum Networks administered by the Army Research Office, and the Office of Naval Research. S.L.B. and P.v.L. were funded in part under project QUICOV as part of the IST-FET-QJPC program. P.v.L. acknowledges support by a DAAD Doktorandenstipendium (HSP III).
Funding AgencyGrant Number
Institute for Quantum Information, CaltechUNSPECIFIED
Army Research Office (ARO)UNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Deutscher Akademischer Austauschdienst (DAAD)UNSPECIFIED
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Deposited On:05 Mar 2006
Last Modified:08 Nov 2021 19:44

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